Bag closure



J. F. DOYLE Jan. 16, 1951 BAG CLOSURE Filed Jan. 4, 1945 mmm Iliff/lll! l INVENTOR A @MES f." DQYLE' Mr ATTORNEYS Patented Jan. 16, 1951 BAG CLOSURE James F. Doyle, Forest Hills, N. Y., assignor to Arkell Safety Bag Company, New a corporation of New York York, N. Y.,

applic-anon January v4, 1945, ser-1eme. 571.2157

(o1. 22a-sz) 4 Claims.

Figure 1 is a view in perspective of a bag having my improved closure means at one end thereof;

Fig. 2 is a, similar View on an enlarged scale of one end portion of the bag with the closure for said end of the bag partly formed;

Fig. 3 is a sectional view, on an enlarged scale, taken on the line 3-3 of Fig. 2;

Fig. 4 is a View in perspective of one end portion of a bag having a modified form of closure means;

Fig. 5 is a. sectional view taken on the line 5 5 of Fig. 4; and

Fig. 6 is a view in perspective of a corner portion of a multi-wall paper bag having gusseted sides, the sealing strip being shown in section for the sake of clearness.

The tube 2 of the bag illustrated in the drawings may be of the usual multi-wall plain paper form, or may be made of crinkled paper of the type of the one described and claimed in the patent to Edwin D. Greene, No. 2,314,876 dated March 30, 1943. In the latter type of bag. the crinkles in the several plies extend transversely o1 the bag tube and the crinkles of adjacent plies are arranged in non-nested relation with the crests of the crinkles of adjacent plies adhesively secured together.

In the form shown'in Figs. l, 2 and 3, a sealing strip 4 which may be made of crinkled paper, with the crinkles arranged transversely thereof, is folded over the end of the bag tube to be closed with the ends of the strip projecting beyond the side edges of the tube. These projecting ends 5 are then folded back upon themselves as shown, the line of fold of the ends tightly engaging the side edges of the bag tube. The end of the bag is then closed by a line of stitching 6 which extends through the sides of the folded strip, through the side walls of the tube and through the folded ends 5 of the strip, the ends of the stitches lextending a, distance beyond the folded over ends of the sealing strip.

- With this construction, it will be noted that the end corners of the bag tube are well protected,- strengthened, and securely closed by the folded over ends 5 of the sealing strip. and the extra double thickness of material at the bag corners through which the stitches pass tends to prevent the stitches from becoming loosened at these points.

In the modified form of closure means shown in Figs. 4 and 5, the end of the bag tube is'iirst closed by a line of stitching I0, the ends l I of the stitching extending a distance beyond the side edges of the bag. A sealing strip l2, corresponding to the strip li, is then folded over the thus closed end of the bag tube and the line of stitching, the projecting ends i4 of the strip enclosing the projecting ends Il of the stitching. The projecting ends I4 of the sealing strip are then folded back upon the body of the strip at one side of the tube. Thefolded over strip may be adhesively secured by melted wax or other adhesive to the walls of the bag.r tube, and the ends I4 adhesively secured to the body of the strip.

It will be noted that in this form of closure means the stitches are well protected by the sealing strip, and the corners of the closed end of the bag tube are reinforced and tightly closed.

Heretofore considerable diiliculty has been experienced in the packaging of iinely comminuted material in multi-wall sewed bags. 'This diculty has been due to the contents of the filled bag sifting out between the end edges of the bag tube and the sealing strip. To overcome this diiiiculty, it has been proposed to dip the bag seam in melted wax to seal the needle holes and to seal the crevice between the end oi the bag tube and the sealing strip. Owing. however, to the tightness of the sewing it has been quite impossible to insure the melted wax getting down between the sealing strip and the .bag tube suilfciently to seal both the needle holes and the crevice between the sealing strip and the lower end Pdges of the bag tube.

In accordance with the present invention. in order to insure effective sealing of the closure means the sealing strip 4 in the rst form above described and the sealing strip I2 in the modified form, is made ri' small and closelv spaced perforated material. The perforations I5 may be approximately finch in diameter and 64 to the souare inch but the size and number of perforations may be varied. Also, the portions ofthe plies of the bag walls underlyingr the strip are preferably provided with perforations l1 which may correspond in size and spacing to the perforaticns i5.

With the use of such perforated sealing strip.

and plies of the bag walls, when the closure means of the bag tube of Figs. 1, 2 and 3 is dipped in the melted wax, the wax I6 is free to pass through the perforations adjacent the needle holes, into the crevice between the sealing strip and the end edges of the bag tube beneath the folded ends of the strip, and through the perforations Il to spread between the plies. Also in the case of bags of the type of said patented Greene bag, the sealing material is free to spread into the valleys between the crests of the crlnkles. With the sealing material thus applied, when pressure is applied to the sealing strip, such as when the bags are baled, effective sealing is insured, Also, it has been found that the perforations insure tight sealing of the strip to the walls of the bag tube throughout the length thereof. By employing finely perforated crinkled paper for the strip, it is found that the strip is not weakened and has all the advantages of the usual unperforated strip.

In the form shown in Figs. 4 and 5, the melted wax freely passes through the perforations I5 so as to ensure sealing of the crevice between the lower ends of the side walls, adhesively securing of the strip to the side walls throughout its area and the folded ends of the strip. and sealing of the needle holes, as well as sealing the plies together.

While the closure means is shown applied to the bottom end of a bag tube, it will be understood that the closure means may be applied likewise to the upper end of the tube either before or after filling of the bag, and may be used for the valve end of a valve bag. In addition to employing wax as the sealing material, various other suitable sealing materials may be employed including resins and bituminous compositions.

In Figure 6v the closure means of this invention is shown applied to one end of a multi-ply paper bag of the type having gusscted sides, such as is shown in the aforementioned patent to Greene. The infolded gusset is indicated generally at I1. The wax I6 penetrates the strip 4 through the perforations I5 and covers the end edge portion of the gusset.

The present application constitutes a continuation in part of my pending application Serial No. 514,228, now abandoned, filed December 14, 1943.

As will be evident to those skilled in the art, my invention permits various modifications without departing from the spirit thereof or the scope of the appended claims.

What I claim is:

1. In a multi-ply paper bag, a bag tube, a sealing strip having the major portion of its area perforated and folded over one end of the bag tube, and sealing material penetrated through the perforations in the strip, and thence between the strip and the underlying portions of the side walls of the bag tube, and between the strip and the edges of the plies of said end of the bag tube.

2. In a multi-ply paper bag, a bag tube having the margin of one end thereof perforated, a sealing strip having the major portions of its area perforated and folded over said end of the bag tube, and sealing material penetrated through the perforations in the strip and thence between the strip and the underlying portions of the side walls of the bag tube, between the strip and the edges of the plies of said end of the bag tube, and through the perforations in the margin of the bag tube and thence between the plies of said margin.

3. In a paper bag formed with a flattened multiwall gusseted tubular body portion, end closure means comprising a longitudinally folded paper strip of generally U-shaped cross-section extending from side-to-side of the bag and positioned astride the end edges thereof, a line of stitches passing through said strip and said end edges as embraced thereby, and extending the length of said strip and securing same in place, and a coating of waxy material covering said strip and stitching, the fold line of said strip at points adjacent the gusset areas being perforated at spaced points, some of said waxy material extending through said perforations into contact with and substantially completely covering said end edge portions of the gusset areas and tightly sealing same with respect to each other and said closure means, the perforated strip protecting said edge portions and the waxy material thereon against disruption of the seal.

4. In a paper bag formed with a flattened body portion, end closure means comprising a longitudinally folded paper strip of generally U-shaped cross section extending from side to side of the bag and positioned astride the end edges thereof, a line of stitches passing through said strip and said end edges as embraced thereby, and extending the length of said strip and securing same in place, and a coating of waxy material covering said strip and stitching, the fold line of said strip being perforated at spaced points substantially the length of said end edges of said tubular body portion, some of the waxy material extending through said perforations into contact with and substantially completely covering said end edges and tightly sealing same with respect to each other and said closure means, the perforated strip protecting said end edges and the waxy material thereon against disruption of the seal.

JAMES F. DOYLE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 460,397 Morgan Sept. 29, 1891 1,736,396 Duvall Nov. 19, 1929 1,767,770 Olsen June 24, 1930 1,857,949 Freydberg May 10, 1932 1,860,190 Le Vesconte May 24, 1932 1,880,277 Pinkerton, Jr Oct. 4, 1932 1,920,320 Rosmait Aug. 1, 1932 1,951,599 Dever Mar. 20, 1934 1,955,310 Powell et al. Apr. 17, 1934 2,006,060 Schilder et al. June 25, 1935 2,093,979 Farmer Sept. 21, 1937 2,185,469 MacDonald Jan. 2, 1940 2,353,311 Karlson July 11, 1944 2,375,544 Faillot May 8, 1945 2,378,054 Weeks et al June l2, 1945 2,391,938 Baker Jan. 1, 1946 2,399,973 Albin May 7, 1946 FOREIGN PATENTS Number Country Date 300,876 Great Britain Nov. 22, 1928 414,175 Great Britain Aug. 2, 1934 

